@lunnyBunny I actually discovered that its hard to do a tail while I was experimenting with the deer, so its one of the first things on my to-do list.
@BoredEngineer “One could actually use it even for something like a car or a tank. The bones would be replaced with gearbox, transmission, differential, wheel axle, engine, fuel tank and etc.” That would be called Mechatronix and it is still very early WIP. 
I don’t have an on/off switch for the component, but it seems like a good feature to have so I am adding it to my to-do list.